Sennheiser Bluetooth devices are designed to be plug and play and hence do not require driver's (software) to be installed on a computer. When a Bluetooth device is being connected to a computer and the computer is prompting for a driver (software) this is actually on the computer side not the headphone side.
Sennheiser devices typically utilize A2DP in order to provide optimal audio over Bluetooth. Most computers' Bluetooth chipsets do not support A2DP (though most smartphones and tablets do). Check your PC's Bluetooth chipset manufacturer's website to see if they offer a firmware upgrade to update the firmware on the Bluetooth chipset to support A2DP and then the computer will be compatible with the headset.